Backlight module and display device

Abstract

A backlight module includes a frame, a first optical film and a fixing assembly. The frame has a near-display panel side and a far-display panel side in a direction perpendicular to a plane enclosed by the frame. The frame includes a frame portion and an extending portion disposed on an inside of the frame portion. The frame portion has at least one film fixing groove, a cross section of the film fixing groove has a stepped shape in a direction perpendicular to a plane enclosed by the frame portion and perpendicular to an edge of the frame portion where the film fixing groove is located. The film fixing groove has a first support surface and a second support surface, and the second support surface is farther away from the near-display panel side than the first support surface.

What is claimed is: 
     
       1. A backlight module, comprising:
 a frame having a near-display panel side and a far-display panel side in a direction perpendicular to a plane enclosed by the frame, the frame including:
 a frame portion having at least one film fixing groove, a cross section of the film fixing groove having a stepped shape in a direction perpendicular to a plane enclosed by the frame portion and perpendicular to an edge of the frame portion where the film fixing groove is located; the film fixing groove having a first support surface and a second support surface, and the second support surface being farther away from the near-display panel side than the first support surface; and 
 an extending portion disposed on an inside of the frame portion; the extending portion having a third support surface, and the third support surface being farther away from the near-display panel side than the first support surface; 
 
 a first optical film, the first optical film including:
 a film body, an edge of the film body being supported by the third support surface; and 
 at least one protrusion portion disposed on the edge of the film body, the protrusion portion being connected to the edge of the film body, extending into the film fixing groove and being supported by the second support surface; and 
 
 a fixing assembly, the fixing assembly including:
 a fixing block supported by the first support surface; and 
 a connection sheet, one end of the connection sheet being connected to the fixing block, and another end of the connection sheet being connected to the protrusion portion of the first optical film. 
 
 
     
     
       2. The backlight module according to  claim 1 , wherein the frame portion further has a fourth support surface, and the fourth support surface is farther away from the far-display panel side than the first support surface; and
 a surface of the fixing block away from the first support surface and the fourth support surface are located in a same plane. 
 
     
     
       3. The backlight module according to  claim 1 , wherein the first support surface includes a first region and a second region that are disposed opposite to each other, and a connection region connecting the first region and the second region;
 an orthogonal projection of the fixing block on a plane where the first support surface is located and any region of the first region, the second region and the connection region have an overlapping region; and 
 an orthogonal projection of the second support surface on the plane where the first support surface is located is located between the first region and the second region. 
 
     
     
       4. The backlight module according to  claim 3 , wherein the connection sheet includes a first connection portion and a second portion;
 the first connection portion is connected to the protrusion portion of the first optical film; and 
 the second connection portion is located between the fixing block and the connection region of the first support surface. 
 
     
     
       5. The backlight module according to  claim 4 , wherein the fixing block is configured to press the second connection portion on the first support surface. 
     
     
       6. The backlight module according to  claim 4 , wherein a dimension of the first connection portion is approximately equal to a dimension of the protrusion portion in a direction from the first region to the second region. 
     
     
       7. The backlight module according to  claim 4 , wherein the connection region is within an orthogonal projection of the second connection portion on the plane where the first support surface is located. 
     
     
       8. The backlight module according to  claim 3 , wherein a dimension of the protrusion portion is less than a distance between the first region and the second region in a direction from the first region to the second region. 
     
     
       9. The backlight module according to  claim 8 , wherein the film body and the frame portion have a distance therebetween. 
     
     
       10. The backlight module according to  claim 2 , further comprising a shielding component, the shielding component including:
 a shielding portion, a portion of the edge of the film body being within an orthogonal projection of the shielding portion on a plane where the first optical film is located; 
 a carrying portion, one end of the carrying portion being connected to a surface of the shielding portion away from the first optical film, and another end of the carrying portion extending to a position where the fourth support surface is located and being supported by the fourth support surface, wherein 
 an orthogonal projection of the fixing block of the fixing assembly on the reference surface is within an orthogonal projection of the shielding portion on a reference surface; and the reference plane is a plane perpendicular to a direction in which the carrying portion extends to the position where the fourth support surface is located; and 
 the protrusion portion is within an orthogonal projection of the carrying portion on the plane where the first optical film is located. 
 
     
     
       11. The backlight module according to  claim 10 , wherein an orthogonal projection of the shielding portion on a plane where the third support surface is located is in the third support surface. 
     
     
       12. The backlight module according to  claim 3 , wherein the fixing block is connected to the first support surface. 
     
     
       13. The backlight module according to  claim 12 , further comprising an adhesive layer bonding both the first region and the fixing block, and the second region and the fixing block, a thickness of the adhesive layer being greater than or equal to a thickness of the second connection portion. 
     
     
       14. The backlight module according to  claim 1 , wherein the connection sheet is flexible, and a thickness of the protrusion portion is less than a distance between the second support surface and the first support surface in a direction perpendicular to a plane where the first optical film is located. 
     
     
       15. The backlight module according to  claim 1 , wherein the connection sheet is made of polyester. 
     
     
       16. The backlight module according to  claim 1 , wherein colors of the connection sheet and the fixing block are same as a color of the first optical film. 
     
     
       17. The backlight module according to  claim 1 , wherein the second support surface and the third support surface are located in a same plane. 
     
     
       18. The backlight module according to  claim 1 , further comprising:
 a light guide plate disposed on the far-display panel side of the frame; and 
 a second optical film disposed between the light guide plate and the frame, an edge of the second optical film being pressed on the light guide plate by the extending portion of the frame. 
 
     
     
       19. The backlight module according to  claim 18 , further comprising:
 a backlight source disposed on a side of the light guide plate; 
 the fixing assembly being disposed on a side of the backlight module where the backlight source is disposed. 
 
     
     
       20. A display device, comprising:
 the backlight module according to  claim 1 ; and 
 a display panel disposed on the near-display panel side of the frame, an edge of the display panel being supported by the frame portion of the frame.